Cutter head



Aug. 16919270 J. E. COVILLE CUTTER HEAD Filed .Auz. 26, 1926 inven oJohnE. Camille,

Patented Aug. 16, 1927.

JOHN E. GOVILLE, OF SWAMIPSCOTT, MASSACHUSETTS, ASSIGNOR OF, ONE-THIRDTO PATENT OFFICE.

THEQDORE w. MCNICHOL, AND ONE-THIRD 'ro THOMAS T. McN cHoL, Borrr'orSWAMIE'SCOTT, MASSACHUSETTS.

' CUTTER HEAD.

Application filed August 26,1926. Serial No. 131,781.v

This invention relates to cutter heads particularly adapted for use inlathes for shaping lasts and similar articles, the object being toproduce a balanced cutter having means for removing superfluous stockfrom the block prior to the actual shaping thereof, and provided withmeans whereby said head may be mounted directly. upon the end of arotary shaft.

These objects are attained by the mechanism illustrated in theaccompanying draw- For the purpose of illustrating the invention, onepreferred form thereof s, illustrated in the drawings, this form havingbeen found to give satisfactory and reliable results, although it is tobe understood that the various instrumentalities of which the inventionconsists can be variously arranged and organized, and the invention isnot limited to the precise arrangement and organ ization oftheseinstrumentalities as herein shown a-nd described except as required bythe scope of the appended claims.

Of the drawings: Figure 1 representsan end elevation of a cutterembodying the principlesof the present invention. Figure 2 represents asection of same .on line 2, 2, on Fig. 1. V Figure 3 represents asectlon on line 3, 3,

onFig.2.

Figure 4 represents .a section on line 4, 4, on Fig. 2.

Figure on Fig. 2,'and

Figure 6 represents'a. section on line 6, 6, on Fig. 2, with the cutterblades and securin bolts therefor removed, and the nut for seduring thehead tothe shaft omitted.

Similar characters indicate like parts throughout the several figures ofthe draw- 1n 5.

i [n the -drawings10 is a revoluble shaft having a cone-shaped portion11v near one end from which extends outwardly a threaded portion 12. I

. The block 13 of the cutter head has a conical bore which is fitted tothe coneshaped portion 11 which has its greatest diameter at its innerend.

The block 13 is provided with four radial slots 14 in its outer face,said slots being] of 5 represents a section of line 5, 5,

different depths and the block 13 on its oppositeend is provided withaprojecting cylindrical hub 15.

In each slot 14.- is fitted a shaping blade I 16, these blades being indifferent planes perpenchcular to the axis of rotation 'of'the block 13and the outer ends of said blades are curved'toward the inner end of theblock 13 and over the periphery thereof.

The block 13 is provided with a peripheral shoulder 16* between whichand the inner end of said block is a cylindrical. portion 17 on whichare mounted side by side two bal-I ancing rings 18. 1

Each ring 18 is eccentric as shown in the drawings one side being muchheavier than the other side. Y

. The combined thickness of these rings 18 -isgreater than the length ofsaid cylindrical portion 17 so that the inner ring projects beyond theend face of the cylindrical portion 17 in contact with an annular'plate19 mounted upon and movable endwise of the hub 15. I

The eccentric rings 18 are provided with peripheral spanner holes 20 bywhich said rings may be accurately adjusted about the axis of the block13 to balance theweight of Y I the heavier blades 16.

Through the block 13, annular. plate 19 and blades-16,extend bolts 21each having a head 22 hearing against the outer face of a blade 16 whilethe opposite end has a nut- 22" threaded thereto.

When the rings 18 have been adjusted properly they may be clamped to theshoulder 16 by turning the nuts 22* and forcing the plate 19 toward saidshoulder.

The extreme outer end of shaft 10 is threaded and has mounted thereonthe nut 2 1, having on its inner end an annular flange 25 which extendsinto a socket in the block 13 and bears against'theend wall thereof,

thereby forcing said block further on the cone portion 11 oji'xthe shaft10. 7 4

The :nut' 24: has two scoring blades formed integral therewith which actupon. the work ahead of the cutting blades 16, removing parts of thewooden blocks and permitting the actual shaping of thelasts to be i morereadily accomplished by the cutting blades 16. The outer endsof thescoring blades 26 are curved with their facestoward the block 13 furtherfrom the axis of shaft 11 than their outer faces.

The nut 24 is so threaded to the shaft that when the blades 26 come intocontact with the work the strainthereon will tendto screw the nutfurther on the shaft and at the same time crowd the block further on thecone portion 11.

The block 1.3 is provided with threaded: holes 27 to receive screwsforming a part of a tool by which said block may be withdrawn from thetapered portion 11 of the shaft to;

This tool forms no part of the present invention and therefore is notshown or described. v

By providing the cutter headwith the balancing rings 18, 18 the cutterhead will rot-ate evenly; I

Moreover, the means of securing the cutter head to the rotating drivingshaft 18 greatly simplified in 'applicants construction.

By providing the scoring blades 26 much of'the' material of the work maybe removed before the cutting and shaping blades come into operation.

The simplification in construction of the cutter head greatly reducesthe'cost of manufacture and by reducingto a minimum the number ofmovable parts'there are fewer elements to get out of order and interferewith the proper operation of: the lathe.

' It is believed that the-operation and many advantages of the inventionwill be understood readily without further description;

Having thus described my invention, I claim:

1; The combination. with: a rotary shaft; a head mounted on the endthereof and pro vided with radial slots in the-outer face thereof atvarying distances from its inner face; cutter'blades disposed lHISZLlClslots and secured to said head; said blades having cutting edges beyondthe periphery of said head; and a nut threaded to the end of said shaftand bearing against the outer end of said head.

2; The combination with. a. rotary shaft; a head mounted on the endthereof and provided with four radialslots inthe outer face thereof atvarying distances from its inner face and perpendicula-r'to each other;cutter blades disposed: in said slots and secured to said head, saidblades having: curved cutting edges beyond the periphery of said head;and a. nut threaded to the end of said shaft and bearing against theouter end of said head.

3; The combination with arotary shaft; a headinounted 011 the endthereof and provided: with radial slots in the outer face thereof;cutter blades disposed insaid slots with; curved. cutting edges beyondthe periphcry of: said head; a bolt securing each cutter blade to saidhead; and a nut threaded to the end of said shaft and bearing againstthe outer end of said head.

4. The combination with a rotary shaft; a head mounted. on the endthereof and provided with radial slots in the outer face thereof; cutterblades disposed in said slots; an annular plate surrounding a hub on theinner end of said head; a bolt extending through each cutter blade andsaid plate;

a nut threaded. to the inner end of each bolt;

and a nut threaded to the end of said shaft and bearing against theouter end of said head. r

5. The combination with a rotary shaft; a head mounted on theend thereofand provided with a plurality'of radial slots all formed in the outerface thereof; cutter blades disposed in said slots and secured to saidhead; each cutter blade having? at its outer end a cutting edge curvedover the periphery of said head and: said cutting edges beingin planesoverlapping. each other; and a nut threaded to the end of said shaft andbearing against the outer end of said head.

6. The? combination with: a rotary shaft;

a head: mounted on theend thereof and provided with a plurality ofradial slots all formed in the outer face thereof; cutter bladesdisposed. in'sai'd' slots and secured to said" head, said: cutter bladeshaving at their outer ends cutting edges curved over the periphery ofsaid head and terminating at different distances from the inner end ofsaid head. said cutting edges-being in: planes overlapping each other;andv a nut'threaded to the end of said shaft and bearing against theouter end of said head.

7. The combination with a rotary shaft having: at one end an axiallydisposed threaded extension; a head mounted near one end of the shaftprovided with aplurality of shaping blades; a nut on said shread'edextension and locking said head: tosaidshaft; and a plurality of scoringblades integral with said nut with the outer faces of their outer endscurved towards said head.

8. The combinationv with a rotary shaft having: a: cone-shaped portionnear its outer end; a head with a conical bore'fitted to saidcone-shaped portion and provided with a plurality of radial slots allformed in the outer face thereof; cuttei blades disposed in said slotsand secured to said head, said blades having: at their outer ends curvedcutting edges extending toward' the opposite wardly therefrom; a headwith a conical bore fitted to said cone-shaped portion; cutter bladessecured to said head and projecting radially therefrom, said bladeshaving curved cutting edges beyond the periphery of said head and inoverlapping planes; and

a nut on said threaded portion adapted to force said head towards thelarger end of said cone-shaped portion and lock it thereto.

10. The combination with a rotary shaft; a head mounted thereon andrevoluble therewith having a shoulder near its outer end and acylindrical portion between said shoulder and its inner end; cutterblades radiating from said head; an annular plate surrounding a hub onthe inner end of said head and revoluble therewith; two eccentricbalancing rings on said cylindrical portionand independently adjustableabout the axis thereof, the combined Widths of said eccentric ringsbeing greater than the length of said cylindrical portion; and meanscarried by said head for moving said annular plate towards said shoulderand clamping.

said eccentric rings to prevent movement thereof about theaXis of saidhead.

Signed by me at Lynn this 16thday of August 1926.

JOHN E. COVILLE.

